Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.12.2024 - 01:25
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31/3-3

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  • General information
    General information
    Attribute Value
    Wellbore name
    Official name of wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    31/3-3
    Type
    Wellbore type. Legal values: EXPLORATION, DEVELOPMENT, OTHER (see 'Purpose' for more information)
    EXPLORATION
    Purpose
    Final classification of the wellbore.

    Legal values for exploration wellbores:
    WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS.

    Legal values for development wellbores:
    OBSERVATION, PRODUCTION, INJECTION, INJECTION-CCS, OBSERVATION-CCS.

    Legal values for other wellbores:
    SOIL DRILLING (drilling in connection with track surveys and other subsurface surveys to investigate the soil conditions prior to placement of facilities),
    SHALLOW GAS (drilling to investigate shallow gas before the first 'real' drilling on the location),
    PILOT (drilling to investigate the geology and fluid connectors for location of the main wellbore),
    SCIENTIFIC (drilling according to Law of Scientific research and exploration),
    STRATIGRAPHIC (driling according to Law of Petroleum activities §2-1).
    WILDCAT
    Status
    Status for the wellbore. Legal values are:

    BLOWOUT: A blowout has occurred in the well.
    CLOSED: A development wellbore that has been closed in a shorter or longer periode. Also applies to development wellbores where drilling is completed, but production/injection has not yet been reported.
    DRILLING: The well is in the drilling phase - can be active drilling, logging, testing or plugging,
    JUNKED: The drilling operation has been terminated due to technical problems.
    P&A: Exploration: The well is plugged and abandoned, and can not be reentered for further use. Development wells: The production/injection from/to the well is stopped and the well is plugged. The wellhead is removed or else made unavailable for further well operations.
    PLUGGED: The wellbore has been plugged, but the upper parts of the wellbore can be re-used. A sidetrack might be drilled at a later stage.
    PRODUCING: It was produced from the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate.
    INJECTING: It was injected to the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate.
    PREDRILLED: The upper part of the well has been drilled, usually as part of a batch-drilling campaign covering several wellbores.
    RE-CLASS TO DEV: Exploration wellbore that is reclassified to a development wellbore.
    RE-CLASS TO TEST: Exploration wellbore that is reclassified to test production.
    SUSPENDED: The drilling operation in the wellbore has been temporarily stopped. The current plan is to continue drilling later on.
    P&A
    Multilateral
    Indicator telling if the parent well is multilateral, meaning it has more than one branch radiating from the main borehole. Example of legal values: YES, NO. See also Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    NO
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    Main area
    Name of the area on the Norwegian Continental Shelf where the wellbore is located. Legal values: BARENTS SEA, NORWEGIAN SEA, NORTH SEA.
    NORTH SEA
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    31/3-3
    Production licence
    Official designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion).
    Drilling operator
    Name of the licensee starting the drilling operation on behalf of the active production license (well head position). This will usually equal the operator of the production license.
    Saga Petroleum ASA
    Drill permit
    The drilling permit number together with the version of the drilling permit as stated in the drilling permit granted by the Norwegian Offshore Directorate.
    438-L
    Drilling facility
    Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.
    Drilling days
    Number of days from wellbore entry to wellbore completion.
    37
    Entered date
    The date when he wellbore was spudded. For sidetracks: The date when new formation was drilled by kicking off from the mother-wellbore,
    13.10.1984
    Completed date
    Exploration wellbores from moveable facilities:
    For floating facilities - date when anchor handling is started. For jackups - date the jacking-down started. Exploration wellbores from fixed facilities and all development wellbores:
    Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore.
    Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore.
    18.11.1984
    Release date
    Date when raw data which has been reported to the authorities from the wellbore is not confidential any longer. Normally 2 years after finishing the drilling. May be earlier if the area of the production license is relinquished.
    18.11.1986
    Publication date
    Date quality control of the wellbore information was completed, so it can be published on the internet as a 'Well Data Summary Sheet' wellbore with more information available than other wellbores.
    15.12.2006
    Purpose - planned
    Pre-drill purpose of the wellbore. Legal values for exploration wellbores: WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS. Example of legal values for development wellbores: OBSERVATION, PRODUCTION, INJECTION.
    WILDCAT
    Content
    For exploration wellbores, status of discovery.

    Legal values:
    DRY, SHOWS (trace amounts of hydrocarbons), GAS, GAS/CONDENSATE, OIL or OIL/GAS.
    SHOWS (GAS SHOWS, OIL SHOWS or OIL/GAS SHOWS) are detected as fluorescent cut (organic extract), petroleum odour, or visual stain on cuttings or cores, or as increased gas reading on the mud-loggers gas detection equipment.
    Legal values for WILDCAT-CCS and APPRAISAL-CCS: WATER

    For development wellbores, type of produced/injected fluid.
    Legal values:
    WATER, CUTTINGS, NOT AVAILABLE, OIL, GAS/CONDENSATE, OIL/GAS, CO2, GAS, WATER/GAS, NOT APPLICABLE.
    DRY
    Discovery wellbore
    Indicator which tells if the wellbore made a new discovery. Legal values: YES, NO. Prior to press-release or other information regarding drilling results, the indicator will be “NO” as a default.
    NO
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    26.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    332.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2573.0
    Final vertical depth (TVD) [m RKB]
    Vertical elevation from total depth to kelly bushing. Shown only for released wells. Referred to as true vertical depth (TVD).
    2571.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    3.7
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    79
    Oldest penetrated age
    Age (according to Geologic Time Scale 2004 by F. M. Gradstein, et al. (2004)) of the oldest penetrated formation. May differ from age at TD for example in deviated wellbores. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EARLY PERMIAN, EARLY TRIASSIC, EOCENE.
    EARLY JURASSIC
    Oldest penetrated formation
    Name of the oldest lithostratigraphic unit penetrated by the wellbore. Shown only for released wells. In most wellbores this is formation or group at total depth. May differ from formation or group at TD for example in wellbores drilled with high deviation or through faults. Examples of legal values: AMUNDSEN FM, BALDER FM, BASEMENT, BLODØKS FM, BRYNE FM, BURTON FM, COOK FM, DRAKE FM, DRAUPNE FM, EKOFISK FM, DUNLIN GP.
    STATFJORD GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 50' 2.29'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 50' 38.16'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6744748.95
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    545884.32
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    31
    NPDID wellbore
    Norwegian Offshore Directorate's unique id for the wellbore.
    447

  • Wellbore history
    General
    The wildcat well 31/3-3 was drilled on a structure east of the Troll Field. The structure, which is deeper than the oil/water contact proved in the Troll Field area, is defined on the Top Sognefjord Formation and situated on a rotated fault block compartment dipping gently to the east. The main objective of the well was to test the Late Jurassic sandstones, which were gas and oil bearing in the Troll Field. A possible stratigraphic trap in the Early Cretaceous sequence and small closures of the Brent Group and Statfjord Formation were secondary targets.
    Operations and results
    Well 31/3-3 was spudded with the semi-submersible installation Treasure Saga on 13 October 1984 and drilled to TD at 2573 m in the Early Jurassic Statfjord Formation. No major problems occurred due to drilling. The well was drilled using spud mud down to 406 m, with KCl/polymer from 406 m to 1630 m, with CaCO3 mud from 1630 m to 2112 m, and with gel/lignosulphonate from 2112 m to TD.
    No reservoir rock was encountered in the Early Cretaceous. In the Jurassic a 152 m thick sequence of Sognefjord Formation consisting of several stacked coarsening upward sand sequences was penetrated. The Statfjord Formation consisted of alternating sandstones and claystones with traces of limestone, mica and coal fragments. The only trace of hydrocarbons in the well were two very weak shows, possibly dope contamination, in cores no 3 and 5 in the Sognefjord Formation. Seven conventional cores were cut, one in the lower part of the Cromer Knoll Group and the last six in the Late Jurassic Sognefjord and Heather Formations. Totally 168.5 m were cut with a recovery of 166.5 m (99%). No fluid samples were taken.
    The well was permanently abandoned on 18 November 1984 as a dry well.
    Testing
    No drill stem test was performed

  • Cuttings at the Norwegian Offshore Directorate
    Cuttings at the Norwegian Offshore Directorate
    Cuttings available for sampling?
    YES
    Cuttings at the Norwegian Offshore Directorate
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    490.00
    2573.00

  • Cores at the Norwegian Offshore Directorate
    Cores at the Norwegian Offshore Directorate
    Core sample number
    Core sample - top depth
    Core sample - bottom depth
    Core sample depth - uom
    1
    1580.0
    1596.0
    [m ]
    2
    1764.0
    1782.0
    [m ]
    3
    1782.0
    1810.0
    [m ]
    4
    1810.0
    1837.5
    [m ]
    5
    1837.5
    1858.9
    [m ]
    6
    1861.0
    1888.5
    [m ]
    7
    1888.5
    1916.5
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    166.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1580-1585m
    Core photo at depth: 1585-1590m
    Core photo at depth: 1590-1595m
    Core photo at depth: 1595-1596m
    Core photo at depth: 1764-1769m
    1580-1585m
    1585-1590m
    1590-1595m
    1595-1596m
    1764-1769m
    Core photo at depth: 1769-1774m
    Core photo at depth: 1774-1779m
    Core photo at depth: 1779-1782m
    Core photo at depth: 1782-1787m
    Core photo at depth: 1787-1792m
    1769-1774m
    1774-1779m
    1779-1782m
    1782-1787m
    1787-1792m
    Core photo at depth: 1792-1797m
    Core photo at depth: 1797-1802m
    Core photo at depth: 1802-1807m
    Core photo at depth: 1807-1810m
    Core photo at depth: 1810-1815m
    1792-1797m
    1797-1802m
    1802-1807m
    1807-1810m
    1810-1815m
    Core photo at depth: 1815-1820m
    Core photo at depth: 1820-1825m
    Core photo at depth: 1825-1830m
    Core photo at depth: 1830-1835m
    Core photo at depth: 1835-1837m
    1815-1820m
    1820-1825m
    1825-1830m
    1830-1835m
    1835-1837m
    Core photo at depth: 1837-1842m
    Core photo at depth: 1842-1847m
    Core photo at depth: 1847-1852m
    Core photo at depth: 1852-1857m
    Core photo at depth: 1857-1858m
    1837-1842m
    1842-1847m
    1847-1852m
    1852-1857m
    1857-1858m
    Core photo at depth: 1861-1866m
    Core photo at depth: 1866-1871m
    Core photo at depth: 1871-1876m
    Core photo at depth: 1876-1881m
    Core photo at depth: 1881-1886m
    1861-1866m
    1866-1871m
    1871-1876m
    1876-1881m
    1881-1886m
    Core photo at depth: 1886-1888m
    Core photo at depth: 1888-1893m
    Core photo at depth: 1893-1898m
    Core photo at depth: 1898-1903m
    Core photo at depth: 1903-1908m
    1886-1888m
    1888-1893m
    1893-1898m
    1898-1903m
    1903-1908m
    Core photo at depth: 1908-1913m
    Core photo at depth: 1913-1916m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1908-1913m
    1913-1916m

  • Casing and leak–off tests
    Casing and leak–off tests
    Casing type
    Casing diam.
    [inch]
    Casing depth
    [m]
    Hole diam.
    [inch]
    Hole depth
    [m]
    LOT/FIT mud eqv.
    [g/cm3]
    Formation test type
    CONDUCTOR
    30
    481.0
    36
    486.0
    0.00
    LOT
    SURF.COND.
    20
    805.0
    26
    1143.0
    1.60
    LOT
    INTERM.
    13 3/8
    1616.0
    17 1/2
    1764.0
    1.54
    LOT
    OPEN HOLE
    2573.0
    12 1/4
    2573.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CALIPER
    566
    632
    CDL CNL GR
    804
    1632
    CDL CNL GR
    1614
    2571
    DIFL LSBHC GR
    481
    815
    DIFL LSBHC GR
    804
    1632
    DIFL LSBHC GR
    1614
    2573
    DIPLOG
    1622
    2573
    FMT
    1775
    2493
    GR
    332
    481
    SPECTRALOG
    1614
    2566
    SWC
    1580
    1596
    SWC
    1764
    1916
    VSP
    710
    2570

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.18
    pdf
    0.39
    pdf
    3.49

  • Documents – reported by the production licence (period for duty of secrecy expired)
    Documents – reported by the production licence (period for duty of secrecy expired)
    Document name
    Document format
    Document size [MB]
    pdf
    13.78
    pdf
    6.05
    pdf
    2.78
    pdf
    0.16
    pdf
    0.84
    pdf
    1.76
    pdf
    0.27
    pdf
    4.24

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    760
    1.10
    20.0
    34.0
    WATER BASED
    22.10.1984
    820
    1.14
    14.0
    26.0
    WATER BASED
    22.10.1984
    1358
    1.20
    16.0
    24.0
    WATER BASED
    22.10.1984
    1764
    1.18
    29.0
    44.0
    WATER BASED
    31.10.1984
    1782
    1.18
    26.0
    39.0
    WATER BASED
    01.11.1984
    1830
    1.18
    26.0
    38.0
    WATER BASED
    02.11.1984
    1917
    1.20
    26.0
    41.0
    WATER BASED
    05.11.1984
    2257
    1.16
    24.0
    13.0
    WATER BASED
    08.11.1984
    2257
    1.16
    25.0
    14.0
    WATER BASED
    09.11.1984
    2257
    1.16
    25.0
    14.0
    WATER BASED
    09.11.1984
    2436
    1.16
    29.0
    14.0
    WATER BASED
    12.11.1984
    2558
    1.16
    30.0
    15.0
    WATER BASED
    13.11.1984

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1765.0
    [m]
    C
    OD
    1766.0
    [m]
    C
    OD
    1768.0
    [m]
    C
    OD
    1770.0
    [m]
    C
    OD
    1775.0
    [m]
    C
    OD
    1780.0
    [m]
    C
    OD
    1785.0
    [m]
    C
    OD
    1786.0
    [m]
    C
    OD
    1800.0
    [m]
    C
    OD
    1816.0
    [m]
    C
    OD
    1825.5
    [m]
    C
    OD
    1830.0
    [m]
    C
    OD
    1837.1
    [m]
    C
    OD
    1837.5
    [m]
    C
    OD
    1839.5
    [m]
    C
    OD
    1841.5
    [m]
    C
    OD
    1843.5
    [m]
    C
    OD
    1845.0
    [m]
    C
    OD
    1849.5
    [m]
    C
    OD
    1854.5
    [m]
    C
    OD
    1856.0
    [m]
    C
    OD
    1856.5
    [m]
    C
    OD
    1863.2
    [m]
    C
    OD
    1866.1
    [m]
    C
    OD
    1879.0
    [m]
    C
    OD
    1884.0
    [m]
    C
    OD
    1885.0
    [m]
    C
    OD
    1895.0
    [m]
    C
    OD
    1896.0
    [m]
    C
    OD
    1908.0
    [m]
    C
    OD
    1910.0
    [m]
    C
    OD

  • Thin sections at the Norwegian Offshore Directorate
    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    1971.00
    [m ]
    1907.00
    [m ]
    1907.00
    [m ]
    1904.00
    [m ]
    1902.00
    [m ]
    1901.00
    [m ]
    1900.00
    [m ]
    1896.00
    [m ]
    1892.00
    [m ]
    1892.00
    [m ]
    1891.00
    [m ]
    1889.00
    [m ]
    1887.00
    [m ]
    1886.00
    [m ]
    1877.00
    [m ]
    1872.00
    [m ]
    1870.00
    [m ]
    1870.00
    [m ]
    1869.00
    [m ]
    1856.00
    [m ]
    1845.00
    [m ]
    1843.00
    [m ]
    1841.00
    [m ]